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Sumi Somaskanda of Deutsche Welle to join the channel as one of the chief presenters in Washington.

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So, is this why Laura Trevelyan left?

Not sure which way casual relationship goes between the two events (but I think there is one), and whether their coincidence with the preparation of U.S. overnights is a coincidence at all - @Newsroom pointed out that Laura Trevelyan lives in NY, not DC, where their studio and soon-to-be-reiforced bureau is.

I figured her being in NYC and the programme resinating from DC might prove problematic when these changes come into play...

On the other hand, she has been doing WNA - sometimes from NY, though most times from DC - for a decade or more, and her NYC residence was not problem of such size to prevent her from doing it.